Lap desk



FIG. 1 is a perspective view of a lap desk showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear elevational view; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1 and 2 are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a lap desk, as shown and described. 